feat(sbb-header): introduce active state

src/elements/header/common/header-action.scss

@@ -25,6 +25,10 @@
   --sbb-header-action-translate-y: 0;
   --sbb-header-action-gap: var(--sbb-spacing-fixed-2x);
   --sbb-header-action-icon-dimension: var(--sbb-size-icon-ui-small);
+  --sbb-header-action-active-border-width: var(--sbb-border-width-2x);
+  --sbb-header-action-active-border-color: var(--sbb-color-black);
+  --sbb-header-action-active-border-margin-inline: var(--sbb-header-action-padding-inline);
+  --sbb-header-action-active-border-scale: 0;
 
   // If expanded, move it left by left padding.
   // As result, the icon should be aligned with the left side of the page wrapper.
@@ -37,6 +41,9 @@
   @include sbb.if-forced-colors {
     --sbb-header-action-border-color: CanvasText;
     --sbb-header-action-color: LinkText;
+
+    // Hide border with forced colors, as state is displayed on border
+    --sbb-header-action-active-border-width: 0rem;
   }
 }
 
@@ -60,13 +67,21 @@
   }
 }
 
+:host(.sbb-active) {
+  --sbb-header-action-active-border-scale: 1;
+
+  @include sbb.if-forced-colors {
+    --sbb-header-action-border-color: Highlight;
+  }
+}
+
 :host([role='button']) {
   @include sbb.if-forced-colors {
     --sbb-header-action-color: ButtonText;
   }
 }
 
-:is(.sbb-header-button, .sbb-header-link) {
+.sbb-action-base {
   @include sbb.text-inherit;
 
   display: flex;
@@ -110,6 +125,19 @@
       @include sbb.focus-outline;
     }
   }
+
+  // Active state border
+  &::after {
+    content: '';
+    position: absolute;
+    border-bottom: var(--sbb-header-action-active-border-width) solid
+      var(--sbb-header-action-active-border-color);
+    inset: auto 0 calc(-1 * var(--sbb-header-action-active-border-width));
+    margin-inline: var(--sbb-header-action-active-border-margin-inline);
+    scale: var(--sbb-header-action-active-border-scale);
+    transition: scale var(--sbb-header-action-transition-easing)
+      var(--sbb-header-action-transition-duration);
+  }
 }
 
 .sbb-header-action__wrapper {
@@ -155,7 +183,10 @@
       --_sbb-header-first-item-padding-shift: calc(
         -0.5 * (var(--sbb-header-action-min-width) - var(--sbb-header-action-icon-dimension))
       );
-      --sbb-header-action-padding-inline-zero: 0;
+      --sbb-header-action-padding-inline-zero: 0rem;
+      --sbb-header-action-active-border-margin-inline: calc(
+        0.5 * (100% - var(--sbb-size-icon-ui-small))
+      );
 
       .sbb-header-action__text {
         @include sbb.screen-reader-only;

src/elements/header/header-button/header-button.stories.ts

@@ -8,16 +8,10 @@ import { sbbSpread } from '../../../storybook/helpers/spread.js';
 import readme from './readme.md?raw';
 import './header-button.js';
 
-const TemplateSingle = (args: Args): TemplateResult => html`
-  <sbb-header-button ${sbbSpread(args)}>${args.text}</sbb-header-button>
-`;
-
-const TemplateMultiple = (args: Args): TemplateResult => html`
-  <div style="display: flex; gap: 2rem;">
-    <sbb-header-button ${sbbSpread(args)}>${args.text} 1</sbb-header-button>
-    <sbb-header-button ${sbbSpread(args)}>${args.text} 2</sbb-header-button>
-    <sbb-header-button ${sbbSpread(args)}>${args.text} 3</sbb-header-button>
-  </div>
+const TemplateSingle = ({ active, text, ...args }: Args): TemplateResult => html`
+  <sbb-header-button ${sbbSpread(args)} class=${active ? 'sbb-active' : ''}>
+    ${text}
+  </sbb-header-button>
 `;
 
 const text: InputType = {
@@ -39,6 +33,12 @@ const iconName: InputType = {
   },
 };
 
+const active: InputType = {
+  control: {
+    type: 'boolean',
+  },
+};
+
 const type: InputType = {
   control: {
     type: 'select',
@@ -84,6 +84,7 @@ const basicArgTypes: ArgTypes = {
   text,
   'expand-from': expandFrom,
   'icon-name': iconName,
+  active,
   type,
   name,
   value,
@@ -95,23 +96,35 @@ const basicArgs: Args = {
   text: 'Menu',
   'expand-from': expandFrom.options![0],
   'icon-name': 'hamburger-menu-small',
+  active: false,
   type: type.options![0],
   name: 'header-button',
   value: 'value',
   form: 'form',
   'aria-label': undefined,
 };
 
-export const sbbHeaderActionButton: StoryObj = {
+export const Default: StoryObj = {
   render: TemplateSingle,
   argTypes: basicArgTypes,
   args: { ...basicArgs },
 };
 
-export const sbbHeaderActionButtonMultiple: StoryObj = {
-  render: TemplateMultiple,
+export const Active: StoryObj = {
+  render: TemplateSingle,
   argTypes: basicArgTypes,
-  args: { ...basicArgs },
+  args: { ...basicArgs, active: true, 'icon-name': 'magnifying-glass-small', text: 'Label' },
+};
+
+export const ExpandFromMedium: StoryObj = {
+  render: TemplateSingle,
+  argTypes: basicArgTypes,
+  args: {
+    ...basicArgs,
+    'icon-name': 'magnifying-glass-small',
+    text: 'Label',
+    'expand-from': 'medium',
+  },
 };
 
 const meta: Meta = {

src/elements/header/header-button/header-button.visual.spec.ts

@@ -6,15 +6,24 @@ import './header-button.js';
 
 describe(`sbb-header-button`, () => {
   describeViewports({ viewports: ['zero', 'medium'] }, () => {
-    for (const state of visualDiffStandardStates) {
-      it(
-        state.name,
-        state.with(async (setup) => {
-          await setup.withFixture(html`
-            <sbb-header-button icon-name="hamburger-menu-small">Menu</sbb-header-button>
-          `);
-        }),
-      );
+    for (const active of [false, true]) {
+      describe(`active=${active}`, () => {
+        for (const state of visualDiffStandardStates) {
+          it(
+            state.name,
+            state.with(async (setup) => {
+              await setup.withFixture(html`
+                <sbb-header-button
+                  icon-name="hamburger-menu-small"
+                  class=${active ? 'sbb-active' : ''}
+                >
+                  Menu
+                </sbb-header-button>
+              `);
+            }),
+          );
+        }
+      });
     }
   });
 });

src/elements/header/header-button/readme.md

@@ -18,6 +18,23 @@ from which the label is displayed; below that, only the icon is visible.
 <sbb-header-button expand-from="medium">Text</sbb-header-button>
 ```
 
+### Style
+
+To indicate an active state, the CSS class `sbb-active` should be set.
+
+From accessibility perspective `aria-current="page"` should be set whenever the CSS class `sbb-active` is set.
+
+```html
+<sbb-header-button
+  icon-name="magnifying-glass-small"
+  href="#"
+  class="sbb-active"
+  aria-current="page"
+>
+  Overview
+</sbb-header-button>
+```
+
 ## Button properties
 
 The component is internally rendered as a button,

src/elements/header/header-link/header-link.stories.ts

@@ -9,16 +9,10 @@ import { sbbSpread } from '../../../storybook/helpers/spread.js';
 import readme from './readme.md?raw';
 import './header-link.js';
 
-const TemplateSingle = (args: Args): TemplateResult => html`
-  <sbb-header-link ${sbbSpread(args)}>${args.text}</sbb-header-link>
-`;
-
-const TemplateMultiple = (args: Args): TemplateResult => html`
-  <div style="display: flex; gap: 2rem;">
-    <sbb-header-link ${sbbSpread(args)}>${args.text} 1</sbb-header-link>
-    <sbb-header-link ${sbbSpread(args)}>${args.text} 2</sbb-header-link>
-    <sbb-header-link ${sbbSpread(args)}>${args.text} 3</sbb-header-link>
-  </div>
+const TemplateSingle = ({ active, text, ...args }: Args): TemplateResult => html`
+  <sbb-header-link ${sbbSpread(args)} class=${active ? 'sbb-active' : ''}>
+    ${text}
+  </sbb-header-link>
 `;
 
 const text: InputType = {
@@ -40,6 +34,12 @@ const iconName: InputType = {
   },
 };
 
+const active: InputType = {
+  control: {
+    type: 'boolean',
+  },
+};
+
 const hrefs = ['https://www.sbb.ch', 'https://github.com/sbb-design-systems/lyne-components'];
 const href: InputType = {
   options: Object.keys(hrefs),
@@ -91,6 +91,7 @@ const basicArgTypes: ArgTypes = {
   text,
   'expand-from': expandFrom,
   'icon-name': iconName,
+  active,
   href,
   target,
   rel,
@@ -102,23 +103,35 @@ const basicArgs: Args = {
   text: 'Menu',
   'expand-from': expandFrom.options![0],
   'icon-name': 'hamburger-menu-small',
+  active: false,
   href: href.options![1],
   target: '_blank',
   rel: undefined,
   download: false,
   'accessibility-label': undefined,
 };
 
-export const sbbHeaderActionLink: StoryObj = {
+export const Default: StoryObj = {
   render: TemplateSingle,
   argTypes: basicArgTypes,
   args: { ...basicArgs },
 };
 
-export const sbbHeaderActionLinkMultiple: StoryObj = {
-  render: TemplateMultiple,
+export const Active: StoryObj = {
+  render: TemplateSingle,
   argTypes: basicArgTypes,
-  args: { ...basicArgs },
+  args: { ...basicArgs, active: true, 'icon-name': 'magnifying-glass-small', text: 'Label' },
+};
+
+export const ExpandFromMedium: StoryObj = {
+  render: TemplateSingle,
+  argTypes: basicArgTypes,
+  args: {
+    ...basicArgs,
+    'icon-name': 'magnifying-glass-small',
+    text: 'Label',
+    'expand-from': 'medium',
+  },
 };
 
 const meta: Meta = {

src/elements/header/header-link/header-link.visual.spec.ts

@@ -6,15 +6,25 @@ import './header-link.js';
 
 describe(`sbb-header-link`, () => {
   describeViewports({ viewports: ['zero', 'medium'] }, () => {
-    for (const state of visualDiffStandardStates) {
-      it(
-        state.name,
-        state.with(async (setup) => {
-          await setup.withFixture(html`
-            <sbb-header-link icon-name="hamburger-menu-small" href="#">Menu</sbb-header-link>
-          `);
-        }),
-      );
+    for (const active of [false, true]) {
+      describe(`active=${active}`, () => {
+        for (const state of visualDiffStandardStates) {
+          it(
+            state.name,
+            state.with(async (setup) => {
+              await setup.withFixture(html`
+                <sbb-header-link
+                  icon-name="hamburger-menu-small"
+                  class=${active ? 'sbb-active' : ''}
+                  href="#"
+                >
+                  Menu
+                </sbb-header-link>
+              `);
+            }),
+          );
+        }
+      });
     }
   });
 });

src/elements/header/header-link/readme.md

@@ -18,6 +18,18 @@ from which the label is displayed; below that, only the icon is visible.
 <sbb-header-link href="#" expand-from="medium">Text</sbb-header-link>
 ```
 
+### Style
+
+To indicate an active state, the CSS class `sbb-active` should be set.
+
+From accessibility perspective `aria-current="page"` should be set whenever the CSS class `sbb-active` is set.
+
+```html
+<sbb-header-link icon-name="magnifying-glass-small" href="#" class="sbb-active" aria-current="page">
+  Overview
+</sbb-header-link>
+```
+
 ## Link properties
 
 The component is internally rendered as a link,

src/elements/header/header/header.stories.ts

@@ -46,7 +46,13 @@ const HeaderBasicTemplate = (
     </sbb-header-button>
     ${args.size === 's' ? appName() : nothing}
     <div class="sbb-header-spacer"></div>
-    <sbb-header-link href="https://www.sbb.ch" target="_blank" icon-name="magnifying-glass-small">
+    <sbb-header-link
+      href="https://www.sbb.ch"
+      target="_blank"
+      icon-name="magnifying-glass-small"
+      class="sbb-active"
+      aria-current="page"
+    >
       Search
     </sbb-header-link>
     ${template}

src/elements/header/header/readme.md

@@ -44,6 +44,29 @@ For the latter, the usage of the `sbb-signet` with `protective-room='panel'` is
 </sbb-header>
 ```
 
+### Active state
+
+To indicate an active state of the `sbb-header-link` or `sbb-header-button`,
+the CSS class `sbb-active` should be set on the corresponding element.
+
+From accessibility perspective `aria-current="page"` should be set whenever the CSS class `sbb-active` is set.
+
+```html
+<sbb-header size="s">
+  <sbb-header-link
+    icon-name="magnifying-glass-small"
+    href="https://sbb.ch/somewhere"
+    class="sbb-active"
+    aria-current="page"
+  >
+    Overview
+  </sbb-header-link>
+  <a slot="logo" aria-label="Homepage" href="/">
+    <sbb-signet slot="logo" protective-room="panel"></sbb-signet>
+  </a>
+</sbb-header>
+```
+
 ### Positioning and visibility
 
 By default, the `sbb-header` has a fixed position at the top of the page;